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@header {
#include "GrClip.h"
#include "GrContext.h"
#include "GrRenderTargetContext.h"
}
@class {
enum PMConversion {
kToPremul_PMConversion = 0,
kToUnpremul_PMConversion = 1,
kPMConversionCnt = 2
};
static bool TestForPreservingPMConversions(GrContext* context) {
static constexpr int kSize = 256;
static constexpr GrPixelConfig kConfig = kRGBA_8888_GrPixelConfig;
SkAutoTMalloc<uint32_t> data(kSize * kSize * 3);
uint32_t* srcData = data.get();
uint32_t* firstRead = data.get() + kSize * kSize;
uint32_t* secondRead = data.get() + 2 * kSize * kSize;
// Fill with every possible premultiplied A, color channel value. There will be 256-y
// duplicate values in row y. We set r, g, and b to the same value since they are handled
// identically.
for (int y = 0; y < kSize; ++y) {
for (int x = 0; x < kSize; ++x) {
uint8_t* color = reinterpret_cast<uint8_t*>(&srcData[kSize*y + x]);
color[3] = y;
color[2] = SkTMin(x, y);
color[1] = SkTMin(x, y);
color[0] = SkTMin(x, y);
}
}
const SkImageInfo ii = SkImageInfo::Make(kSize, kSize,
kRGBA_8888_SkColorType, kPremul_SkAlphaType);
sk_sp<GrRenderTargetContext> readRTC(context->makeDeferredRenderTargetContext(
SkBackingFit::kExact,
kSize, kSize,
kConfig, nullptr));
sk_sp<GrRenderTargetContext> tempRTC(context->makeDeferredRenderTargetContext(
SkBackingFit::kExact,
kSize, kSize,
kConfig, nullptr));
if (!readRTC || !readRTC->asTextureProxy() || !tempRTC) {
return false;
}
GrSurfaceDesc desc;
desc.fOrigin = kTopLeft_GrSurfaceOrigin;
desc.fWidth = kSize;
desc.fHeight = kSize;
desc.fConfig = kConfig;
sk_sp<GrTextureProxy> dataProxy = GrSurfaceProxy::MakeDeferred(context->resourceProvider(),
desc,
SkBudgeted::kYes, data, 0);
if (!dataProxy) {
return false;
}
static const SkRect kRect = SkRect::MakeIWH(kSize, kSize);
// We do a PM->UPM draw from dataTex to readTex and read the data. Then we do a UPM->PM draw
// from readTex to tempTex followed by a PM->UPM draw to readTex and finally read the data.
// We then verify that two reads produced the same values.
GrPaint paint1;
GrPaint paint2;
GrPaint paint3;
std::unique_ptr<GrFragmentProcessor> pmToUPM(
new GrConfigConversionEffect(kToUnpremul_PMConversion));
std::unique_ptr<GrFragmentProcessor> upmToPM(
new GrConfigConversionEffect(kToPremul_PMConversion));
paint1.addColorTextureProcessor(dataProxy, nullptr, SkMatrix::I());
paint1.addColorFragmentProcessor(pmToUPM->clone());
paint1.setPorterDuffXPFactory(SkBlendMode::kSrc);
readRTC->fillRectToRect(GrNoClip(), std::move(paint1), GrAA::kNo, SkMatrix::I(), kRect,
kRect);
if (!readRTC->readPixels(ii, firstRead, 0, 0, 0)) {
return false;
}
paint2.addColorTextureProcessor(readRTC->asTextureProxyRef(), nullptr,
SkMatrix::I());
paint2.addColorFragmentProcessor(std::move(upmToPM));
paint2.setPorterDuffXPFactory(SkBlendMode::kSrc);
tempRTC->fillRectToRect(GrNoClip(), std::move(paint2), GrAA::kNo, SkMatrix::I(), kRect,
kRect);
paint3.addColorTextureProcessor(tempRTC->asTextureProxyRef(), nullptr,
SkMatrix::I());
paint3.addColorFragmentProcessor(std::move(pmToUPM));
paint3.setPorterDuffXPFactory(SkBlendMode::kSrc);
readRTC->fillRectToRect(GrNoClip(), std::move(paint3), GrAA::kNo, SkMatrix::I(), kRect,
kRect);
if (!readRTC->readPixels(ii, secondRead, 0, 0, 0)) {
return false;
}
for (int y = 0; y < kSize; ++y) {
for (int x = 0; x <= y; ++x) {
if (firstRead[kSize * y + x] != secondRead[kSize * y + x]) {
return false;
}
}
}
return true;
}
}
@make {
static std::unique_ptr<GrFragmentProcessor> Make(std::unique_ptr<GrFragmentProcessor> fp,
PMConversion pmConversion) {
if (!fp) {
return nullptr;
}
std::unique_ptr<GrFragmentProcessor> ccFP(new GrConfigConversionEffect(pmConversion));
std::unique_ptr<GrFragmentProcessor> fpPipeline[] = { std::move(fp), std::move(ccFP) };
return GrFragmentProcessor::RunInSeries(fpPipeline, 2);
}
}
layout(key) in int pmConversion;
@emitCode {
fragBuilder->forceHighPrecision();
}
void main() {
// Aggressively round to the nearest exact (N / 255) floating point value. This lets us find a
// round-trip preserving pair on some GPUs that do odd byte to float conversion.
sk_OutColor = floor(sk_InColor * 255 + 0.5) / 255;
@switch (pmConversion) {
case 0 /* kToPremul_PMConversion */:
sk_OutColor.rgb = floor(sk_OutColor.rgb * sk_OutColor.a * 255 + 0.5) / 255;
break;
case 1 /* kToUnpremul_PMConversion */:
sk_OutColor.rgb = sk_OutColor.a <= 0.0 ?
half3(0) :
floor(sk_OutColor.rgb / sk_OutColor.a * 255 + 0.5) / 255;
break;
}
}
@test(data) {
PMConversion pmConv = static_cast<PMConversion>(data->fRandom->nextULessThan(kPMConversionCnt));
return std::unique_ptr<GrFragmentProcessor>(new GrConfigConversionEffect(pmConv));
}
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